[XP] Phone won't start (dead?)

hi, i'm unable to start my phone. all of a sudden it turned off while being on charger.
The LED now lights dim red (if on charger) and does nothing. Pressing any side buttons do nothing, just the led still lights dim red. Plugging off charger cable doesn't make any difference just the LED turns off.
Can this be due to battery not charging? It has power off shortly ago due full discharge. I plugged in charger, phone turned on for a while indicating charging by LED bright red. Phone was awake about several minutes, then this sudden die.
Any help is highly apreciated.

It was solved! The phone kicked in 30 minutes after, now behaves normal.
Anyway curious why the phone didn't start so long. Tho discharged it had power supply.
I replaced battery recently, so maybe a bad contact or the cord dropped out?

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